Hydac Fluidtechnik Gmbh

Hydac Mobilhydraulik Gmbh

Peter Bruck

Markus Bill

Frank Schulz

Philipp Hilzendegen

Thorsten Hillesheim

Gerd Schneider

Hermann Albert

Martin Grill

Alois Hoffmann

Christian Stauch

Marcus Karl Pfeiffer

Philippe Vande Kerckhove

Dominique Dehlinger

Markus Veit

Benjamin Röder

Patrick Hans

Frank Niehren

Jan Lübbert

The invention relates to a valve, in particular a proportional pressure regulating valve, comprising a valve housing () and a valve piston () which is arranged in the valve housing in a longitudinal a movable manner and which can be actuated by means of an actuation magnet () so as to produce either a fluidic connection between a pressure supply connection (P) and a load connection (A) or between the load connection (A) and a return connection (T) in the valve housing (), wherein the valve piston () is permanently fluidically connected to the return connection (T) at the opposing end faces () of the valve piston. The invention is characterized in that the valve piston () has a pressure-active measuring surface () in the region of the load connection (A), said pressure-active measuring surface providing the respective fluid pressure at the load connection (A) as a counterforce to the actuation force of the actuation magnet () when the actuation magnet () is energized in order to produce a fluidic connection between the pressure supply connection (P) and the load connection (A).

Valve for providing a fluid-conducting connection between a pressure supply port and a consumer port or between the consumer port and a return port

A system for charging and discharging at least one hydraulic accumulator () can be connected to a valve control device (). The valve control device () has at least one logic valve (). A shuttle valve () and a hydraulically operated switching valve () are also provided. The valves () are interconnected such that the hydraulically actuatable switching valve () compares the accumulator pressure (p) to a minimum accumulator pressure (p) that can be adjusted via the control pressure setting of this switching valve ().

System for charging and discharging at least one hydraulic accumulator

A valve, in particular for use as a pressure compensator or maintenance-type component () in hydraulically actuated hoisting devices (), has a valve housing () with a control port (), a fluid inlet () and a fluid outlet (). A regulating piston () is longitudinally displaceably in the valve housing () and acts against an energy storage device () in the form of a compression spring, bringing the regulating piston () into positions forming a fluid-conveying connection between the fluid inlet () and the fluid outlet () or blocking this connection by a control pressure existing at the control port (). A first orifice () in the regulating piston () connects the control port () to a receiving space () for the energy storage device () in a fluid-conveying manner. A second orifice () is in an intermediate part () in the valve housing (). The receiving space () can be connected to a compensating chamber (), which connected to the fluid outlet () in a fluid-conveying manner ().

Pressure compensator valve

A valve arrangement for supplying pressure medium to a hydraulic consumer has two utility ports (A, B) for fluid connection to the consumer and has a first control valve. The first control valve () has a first intake () via which a first intake flow from the first utility port (A) to the consumer () is controllable, has a first return control orifice () via which a first return flow () from the consumer () via the second utility port (B) is controllable simultaneously with the first intake (), has a second intake () via which a second intake flow from the second utility port (B) to the consumer () is controllable, and having a second return control orifice (), via which a second return flow () from the consumer () via the first utility port (A) is controllable simultaneously with the second intake (). A second control valve () has an intake control orifice () used to control the respective intake () of the first control valve ().

Valve arrangement for pressure medium supply of a hydraulic consumer

A control piston () is longitudinally displaceable in a housing () having two connection points (P, A) for fluid, and cooperates with a metering edge () of the housing () at a connection point (P). Point (P), in control positions of the control piston (), supplies the connection point (A) with fluid via a fluid connection. The piston, as a result of occurring flow forces, tends to be drawn in the direction of a closing position that blocks one of these fluid connections. To compensate the flow force, the control piston () has, in the region of the control edge () of the housing (), a shape modification () of its cylindrical exterior basic form (), such that a flow contact surface () for fluid is created. The contact surface transfers a compensating force that acts against the flow force to the control piston () and that seeks to pull the control piston () into an opening position opposed to the closing position.

Device for flow force compensation

A valve, in particular a 4/2-way slide valve (), includes a valve piston (), which is guided in a longitudinally movable manner in a valve housing (), for selectively connecting and disconnecting fluid connections in the valve housing (), such as a pressure supply connection (P), a tank connection (T), and two utility connections (A, B). A magnetic system (), to which current can be supplied, controls the valve piston (). When no current is supplied to the magnetic system (), the control pressure at one of the utility connections (A, B) can be set, in particular limited, by a control device () arranged in the valve housing.

Valve, in particular a 4/2-way slide valve

A hydraulic hybrid system for rotatory applications has an actuator () in the form of a motor pump unit (). The motor pump unit is coupled to a rotatory-operating device () and works as a consumer of hydraulic energy in one operating state of the device () and works as a producer of hydraulic energy in another operating state of the device (). A hydraulic accumulator () can be charged by the motor pump unit () for energy storage in the one operating state and can be discharged for energy release to the motor pump unit () in the other operating state. The hydraulic accumulator is an adjustable hydropneumatic piston accumulator () in which a plurality of pressure chambers () are delimited by active surfaces () of different sizes on the fluid side of the accumulator piston (). An adjusting arrangement () connects a selected pressure chamber () or a plurality of selected pressure chambers () of the piston accumulator () to the actuator () depending on the prevailing pressure level on the gas side of the piston accumulator () and at the actuator ().

Hydraulic hybrid system for rotatory applications

A proportional pressure regulating valve has a spring-loaded valve piston () guided in and actuated by an actuating magnet () within a valve housing (). Opposite valve piston sides are exposed to tank pressure. The valve piston () has a regulation surface () connectable to working port (A) for a regulation pressure (PR). A ring-shaped chamber () in the valve housing () opens into the working port (A). At the transition between the ring-shaped chamber () and the working port (A), the regulation surface () is active. When the actuating magnet () is deenergized, a maximum regulation pressure (PR) is generated.

Valve, in particular proportional pressure regulating valve

A valve, in particular a proportional pressure regulating valve, has a valve piston () longitudinally movable in a valve housing () for alternately releasing and connecting a user connection (A) to a pressure supply port (P) or a tank connection (T). The valve piston can be actuated by an actuating magnet () that produces a dither signal during operation. The valve piston () reaches a floating position within the valve housing () by a hydraulic lift limitation for the receipt of the dither signal.

Valve

A system for hydraulic systems includes a working cylinder () which operates as a consumer of hydraulic energy or as a generator of hydraulic energy. A hydraulic accumulator () can be charged by the working cylinder for storing energy and can be discharged for delivering energy to the working cylinder (). One hydraulic accumulator is provided in the form of an adjustable hydropneumatic piston accumulator (), in which with a plurality of pressure chambers () adjoining effective surfaces () of different sizes are on the fluid side of the accumulator piston (). An adjusting arrangement () connects a selected pressure chamber () or a plurality of selected pressure chambers () of the piston accumulator () to the working cylinder () as a function of the pressure level that prevails respectively on the gas side of the piston accumulator () and on the working cylinder ().

System for improving the energy efficiency in hydraulic systems

A pressure-limiting valve with feed function includes a valve housing () having a working connection (A) and a tank connection (T). A spring-loaded pressure-limiting valve piston () is mounted and longitudinally movable in the valve housing (). A spring-loaded non-return valve piston () for the implementation of the feed function is designed as a hollow piston and is mounted to be longitudinally movable in the valve housing ().

Pressure-limiting valve

A proportional pressure regulating valve has a valve piston () longitudinally movable in a valve housing () and connecting a utility connection (A) to a pressure supply connection (P) or to a tank or return flow connection (T) dependent on the displacement position of the valve piston. The valve piston is actuated by an actuation magnet () that can be supplied with current. A control device () is between the valve piston () and the actuation magnet (), and allows the valve piston () to become pressureless on the valve piston side () facing the actuation magnet (). The valve piston () is displaced in the direction of the actuation magnet () under the supply and/or utility connection pressure when the actuation magnet is not actuated.

Valve device

A valve has a valve piston () guided longitudinally movably in a valve housing () and actuated by an operation device (). In one valve piston position, a connection is produced between a pressure supply port (P) and a working port (A). In another valve piston position, a further fluid-conducting connection is produced between the working port (A) and a tank port (T). The pressure difference arising between the working port (A) and the tank port (T) as flow passes through the further fluid-conducting connection acts, by an actuation device (), on the valve piston (). The valve piston passes from a stop position (), with the further fluid-conducting connection shut off, into a fully open opening position with an enlarged opening cross section from working port (A) to tank port (T).

Valve, and the use thereof for a clutch

A valve, in particular a pilot-operated proportional pressure control valve, has a valve housing () with a pressure supply port (), a working port (), and a drain port (). In the valve housing (), a main valve piston () can be moved by a pilot stage () for control of the fluid flow between the pressure supply port () and the working port (). The pilot stage () has a valve closing element () for a pilot chamber (). The valve closing element () is movable from an open position (OS) into a closed position (SS) by an actuating apparatus (). The valve closing element () can actuate a leakage reduction stage ().

Valve, in particular pilot-operated proportional pressure control valve

A control device selectively fluidically connects and disconnects fluid connection points (A, P, T) by a valve (), which controls fluid-conducting connection channels () extending between the connection points (A, P, T). The connection channels are arranged in a control block (), into which the valve () is at least partially inserted. Proceeding from the respective fluid connection points (A, P, T), the connection channels () connected to the fluid connection points extend in parallel to each other until the connection channels lead into a respective control chamber (). The valve () is retained in a receptacle () separating two adjacently arranged control chambers () from each other.

Growing community of inventors

Althornbach, Germany

Peter Bruck